Matlab Video File memory limitation

I tried to open a 1080p XVID file in matlab, and 640 * 480 raw video file into matlab with the hasframe and read frame and videoreader command, but the number of frames opened by each video in matlab is less than the actual total number of frames in each video.

1080p XVID video -> original frames number -> 35,000 -> opened on matlab -> 4500

640 * 480 video -> original frames number -> 13,500 -> opened on matlab -> 11500

Using FFMPEG to extract and dump the raw frames gives me the entire range of frames of both the videos.

Is this expected? Please let me know if I have missed something.

The workaround I follow is extract all the frames using ffmpeg, and read the image sequence from the folder.